Re: [Qemu-devel] [PATCH v2] block: move I/O request processing to block/io.c

[Stefan Hajnoczi]

On Tue, Feb 17, 2015 at 09:12:45AM -0700, Eric Blake wrote:
> On 02/17/2015 07:39 AM, Stefan Hajnoczi wrote:
> > -void bdrv_drain_all(void)
> > -{
> > -    /* Always run first iteration so any pending completion BHs run */
> > -    bool busy = true;
> > -    BlockDriverState *bs;
> > -
> > -    while (busy) {
> > -        busy = false;
> > -
> > -        QTAILQ_FOREACH(bs, &bdrv_states, device_list) {
> > -            AioContext *aio_context = bdrv_get_aio_context(bs);
> > -
> 
> > +void bdrv_drain_all(void)
> > +{
> > +    /* Always run first iteration so any pending completion BHs run */
> > +    bool busy = true;
> > +    BlockDriverState *bs = NULL;
> > +
> > +    while (busy) {
> > +        busy = false;
> > +
> > +        while ((bs = bdrv_next(bs))) {
> > +            AioContext *aio_context = bdrv_get_aio_context(bs);
> > +
> 
> You switched iteration from QTAILQ_FOREACH to a while(bdrv_next()) loop,
> here, and in bdrv_flush_all.

Forgot about that, sorry.  This change is necessary because bdrv_states
is a static variable in block.c.  Use the bdrv_next() API to iterate
over BDS devices.

Kevin: Please add this to the commit message.

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